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1 : /*
2 : * Copyright © 2009 Red Hat, Inc.
3 : * Copyright © 2011 Google, Inc.
4 : *
5 : * This is part of HarfBuzz, a text shaping library.
6 : *
7 : * Permission is hereby granted, without written agreement and without
8 : * license or royalty fees, to use, copy, modify, and distribute this
9 : * software and its documentation for any purpose, provided that the
10 : * above copyright notice and the following two paragraphs appear in
11 : * all copies of this software.
12 : *
13 : * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 : * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 : * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 : * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
17 : * DAMAGE.
18 : *
19 : * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 : * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 : * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 : * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 : * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 : *
25 : * Red Hat Author(s): Behdad Esfahbod
26 : * Google Author(s): Behdad Esfahbod
27 : */
28 :
29 : #include "hb-private.hh"
30 :
31 : #include "hb-glib.h"
32 :
33 : #include "hb-unicode-private.hh"
34 :
35 :
36 : #if !GLIB_CHECK_VERSION(2,29,14)
37 : static const hb_script_t
38 : glib_script_to_script[] =
39 : {
40 : HB_SCRIPT_COMMON,
41 : HB_SCRIPT_INHERITED,
42 : HB_SCRIPT_ARABIC,
43 : HB_SCRIPT_ARMENIAN,
44 : HB_SCRIPT_BENGALI,
45 : HB_SCRIPT_BOPOMOFO,
46 : HB_SCRIPT_CHEROKEE,
47 : HB_SCRIPT_COPTIC,
48 : HB_SCRIPT_CYRILLIC,
49 : HB_SCRIPT_DESERET,
50 : HB_SCRIPT_DEVANAGARI,
51 : HB_SCRIPT_ETHIOPIC,
52 : HB_SCRIPT_GEORGIAN,
53 : HB_SCRIPT_GOTHIC,
54 : HB_SCRIPT_GREEK,
55 : HB_SCRIPT_GUJARATI,
56 : HB_SCRIPT_GURMUKHI,
57 : HB_SCRIPT_HAN,
58 : HB_SCRIPT_HANGUL,
59 : HB_SCRIPT_HEBREW,
60 : HB_SCRIPT_HIRAGANA,
61 : HB_SCRIPT_KANNADA,
62 : HB_SCRIPT_KATAKANA,
63 : HB_SCRIPT_KHMER,
64 : HB_SCRIPT_LAO,
65 : HB_SCRIPT_LATIN,
66 : HB_SCRIPT_MALAYALAM,
67 : HB_SCRIPT_MONGOLIAN,
68 : HB_SCRIPT_MYANMAR,
69 : HB_SCRIPT_OGHAM,
70 : HB_SCRIPT_OLD_ITALIC,
71 : HB_SCRIPT_ORIYA,
72 : HB_SCRIPT_RUNIC,
73 : HB_SCRIPT_SINHALA,
74 : HB_SCRIPT_SYRIAC,
75 : HB_SCRIPT_TAMIL,
76 : HB_SCRIPT_TELUGU,
77 : HB_SCRIPT_THAANA,
78 : HB_SCRIPT_THAI,
79 : HB_SCRIPT_TIBETAN,
80 : HB_SCRIPT_CANADIAN_SYLLABICS,
81 : HB_SCRIPT_YI,
82 : HB_SCRIPT_TAGALOG,
83 : HB_SCRIPT_HANUNOO,
84 : HB_SCRIPT_BUHID,
85 : HB_SCRIPT_TAGBANWA,
86 :
87 : /* Unicode-4.0 additions */
88 : HB_SCRIPT_BRAILLE,
89 : HB_SCRIPT_CYPRIOT,
90 : HB_SCRIPT_LIMBU,
91 : HB_SCRIPT_OSMANYA,
92 : HB_SCRIPT_SHAVIAN,
93 : HB_SCRIPT_LINEAR_B,
94 : HB_SCRIPT_TAI_LE,
95 : HB_SCRIPT_UGARITIC,
96 :
97 : /* Unicode-4.1 additions */
98 : HB_SCRIPT_NEW_TAI_LUE,
99 : HB_SCRIPT_BUGINESE,
100 : HB_SCRIPT_GLAGOLITIC,
101 : HB_SCRIPT_TIFINAGH,
102 : HB_SCRIPT_SYLOTI_NAGRI,
103 : HB_SCRIPT_OLD_PERSIAN,
104 : HB_SCRIPT_KHAROSHTHI,
105 :
106 : /* Unicode-5.0 additions */
107 : HB_SCRIPT_UNKNOWN,
108 : HB_SCRIPT_BALINESE,
109 : HB_SCRIPT_CUNEIFORM,
110 : HB_SCRIPT_PHOENICIAN,
111 : HB_SCRIPT_PHAGS_PA,
112 : HB_SCRIPT_NKO,
113 :
114 : /* Unicode-5.1 additions */
115 : HB_SCRIPT_KAYAH_LI,
116 : HB_SCRIPT_LEPCHA,
117 : HB_SCRIPT_REJANG,
118 : HB_SCRIPT_SUNDANESE,
119 : HB_SCRIPT_SAURASHTRA,
120 : HB_SCRIPT_CHAM,
121 : HB_SCRIPT_OL_CHIKI,
122 : HB_SCRIPT_VAI,
123 : HB_SCRIPT_CARIAN,
124 : HB_SCRIPT_LYCIAN,
125 : HB_SCRIPT_LYDIAN,
126 :
127 : /* Unicode-5.2 additions */
128 : HB_SCRIPT_AVESTAN,
129 : HB_SCRIPT_BAMUM,
130 : HB_SCRIPT_EGYPTIAN_HIEROGLYPHS,
131 : HB_SCRIPT_IMPERIAL_ARAMAIC,
132 : HB_SCRIPT_INSCRIPTIONAL_PAHLAVI,
133 : HB_SCRIPT_INSCRIPTIONAL_PARTHIAN,
134 : HB_SCRIPT_JAVANESE,
135 : HB_SCRIPT_KAITHI,
136 : HB_SCRIPT_TAI_THAM,
137 : HB_SCRIPT_LISU,
138 : HB_SCRIPT_MEETEI_MAYEK,
139 : HB_SCRIPT_OLD_SOUTH_ARABIAN,
140 : HB_SCRIPT_OLD_TURKIC,
141 : HB_SCRIPT_SAMARITAN,
142 : HB_SCRIPT_TAI_VIET,
143 :
144 : /* Unicode-6.0 additions */
145 : HB_SCRIPT_BATAK,
146 : HB_SCRIPT_BRAHMI,
147 : HB_SCRIPT_MANDAIC,
148 :
149 : /* Unicode-6.1 additions */
150 : HB_SCRIPT_CHAKMA,
151 : HB_SCRIPT_MEROITIC_CURSIVE,
152 : HB_SCRIPT_MEROITIC_HIEROGLYPHS,
153 : HB_SCRIPT_MIAO,
154 : HB_SCRIPT_SHARADA,
155 : HB_SCRIPT_SORA_SOMPENG,
156 : HB_SCRIPT_TAKRI
157 : };
158 : #endif
159 :
160 : hb_script_t
161 0 : hb_glib_script_to_script (GUnicodeScript script)
162 : {
163 : #if GLIB_CHECK_VERSION(2,29,14)
164 0 : return (hb_script_t) g_unicode_script_to_iso15924 (script);
165 : #else
166 : if (likely ((unsigned int) script < ARRAY_LENGTH (glib_script_to_script)))
167 : return glib_script_to_script[script];
168 :
169 : if (unlikely (script == G_UNICODE_SCRIPT_INVALID_CODE))
170 : return HB_SCRIPT_INVALID;
171 :
172 : return HB_SCRIPT_UNKNOWN;
173 : #endif
174 : }
175 :
176 : GUnicodeScript
177 0 : hb_glib_script_from_script (hb_script_t script)
178 : {
179 : #if GLIB_CHECK_VERSION(2,29,14)
180 0 : return g_unicode_script_from_iso15924 (script);
181 : #else
182 : unsigned int count = ARRAY_LENGTH (glib_script_to_script);
183 : for (unsigned int i = 0; i < count; i++)
184 : if (glib_script_to_script[i] == script)
185 : return (GUnicodeScript) i;
186 :
187 : if (unlikely (script == HB_SCRIPT_INVALID))
188 : return G_UNICODE_SCRIPT_INVALID_CODE;
189 :
190 : return G_UNICODE_SCRIPT_UNKNOWN;
191 : #endif
192 : }
193 :
194 :
195 : static hb_unicode_combining_class_t
196 0 : hb_glib_unicode_combining_class (hb_unicode_funcs_t *ufuncs HB_UNUSED,
197 : hb_codepoint_t unicode,
198 : void *user_data HB_UNUSED)
199 :
200 : {
201 0 : return (hb_unicode_combining_class_t) g_unichar_combining_class (unicode);
202 : }
203 :
204 : static unsigned int
205 0 : hb_glib_unicode_eastasian_width (hb_unicode_funcs_t *ufuncs HB_UNUSED,
206 : hb_codepoint_t unicode,
207 : void *user_data HB_UNUSED)
208 : {
209 0 : return g_unichar_iswide (unicode) ? 2 : 1;
210 : }
211 :
212 : static hb_unicode_general_category_t
213 0 : hb_glib_unicode_general_category (hb_unicode_funcs_t *ufuncs HB_UNUSED,
214 : hb_codepoint_t unicode,
215 : void *user_data HB_UNUSED)
216 :
217 : {
218 : /* hb_unicode_general_category_t and GUnicodeType are identical */
219 0 : return (hb_unicode_general_category_t) g_unichar_type (unicode);
220 : }
221 :
222 : static hb_codepoint_t
223 0 : hb_glib_unicode_mirroring (hb_unicode_funcs_t *ufuncs HB_UNUSED,
224 : hb_codepoint_t unicode,
225 : void *user_data HB_UNUSED)
226 : {
227 0 : g_unichar_get_mirror_char (unicode, &unicode);
228 0 : return unicode;
229 : }
230 :
231 : static hb_script_t
232 0 : hb_glib_unicode_script (hb_unicode_funcs_t *ufuncs HB_UNUSED,
233 : hb_codepoint_t unicode,
234 : void *user_data HB_UNUSED)
235 : {
236 0 : return hb_glib_script_to_script (g_unichar_get_script (unicode));
237 : }
238 :
239 : static hb_bool_t
240 0 : hb_glib_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
241 : hb_codepoint_t a,
242 : hb_codepoint_t b,
243 : hb_codepoint_t *ab,
244 : void *user_data HB_UNUSED)
245 : {
246 : #if GLIB_CHECK_VERSION(2,29,12)
247 0 : return g_unichar_compose (a, b, ab);
248 : #endif
249 :
250 : /* We don't ifdef-out the fallback code such that compiler always
251 : * sees it and makes sure it's compilable. */
252 :
253 : gchar utf8[12];
254 : gchar *normalized;
255 : int len;
256 : hb_bool_t ret;
257 :
258 : len = g_unichar_to_utf8 (a, utf8);
259 : len += g_unichar_to_utf8 (b, utf8 + len);
260 : normalized = g_utf8_normalize (utf8, len, G_NORMALIZE_NFC);
261 : len = g_utf8_strlen (normalized, -1);
262 : if (unlikely (!len))
263 : return false;
264 :
265 : if (len == 1) {
266 : *ab = g_utf8_get_char (normalized);
267 : ret = true;
268 : } else {
269 : ret = false;
270 : }
271 :
272 : g_free (normalized);
273 : return ret;
274 : }
275 :
276 : static hb_bool_t
277 0 : hb_glib_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
278 : hb_codepoint_t ab,
279 : hb_codepoint_t *a,
280 : hb_codepoint_t *b,
281 : void *user_data HB_UNUSED)
282 : {
283 : #if GLIB_CHECK_VERSION(2,29,12)
284 0 : return g_unichar_decompose (ab, a, b);
285 : #endif
286 :
287 : /* We don't ifdef-out the fallback code such that compiler always
288 : * sees it and makes sure it's compilable. */
289 :
290 : gchar utf8[6];
291 : gchar *normalized;
292 : int len;
293 : hb_bool_t ret;
294 :
295 : len = g_unichar_to_utf8 (ab, utf8);
296 : normalized = g_utf8_normalize (utf8, len, G_NORMALIZE_NFD);
297 : len = g_utf8_strlen (normalized, -1);
298 : if (unlikely (!len))
299 : return false;
300 :
301 : if (len == 1) {
302 : *a = g_utf8_get_char (normalized);
303 : *b = 0;
304 : ret = *a != ab;
305 : } else if (len == 2) {
306 : *a = g_utf8_get_char (normalized);
307 : *b = g_utf8_get_char (g_utf8_next_char (normalized));
308 : /* Here's the ugly part: if ab decomposes to a single character and
309 : * that character decomposes again, we have to detect that and undo
310 : * the second part :-(. */
311 : gchar *recomposed = g_utf8_normalize (normalized, -1, G_NORMALIZE_NFC);
312 : hb_codepoint_t c = g_utf8_get_char (recomposed);
313 : if (c != ab && c != *a) {
314 : *a = c;
315 : *b = 0;
316 : }
317 : g_free (recomposed);
318 : ret = true;
319 : } else {
320 : /* If decomposed to more than two characters, take the last one,
321 : * and recompose the rest to get the first component. */
322 : gchar *end = g_utf8_offset_to_pointer (normalized, len - 1);
323 : gchar *recomposed;
324 : *b = g_utf8_get_char (end);
325 : recomposed = g_utf8_normalize (normalized, end - normalized, G_NORMALIZE_NFC);
326 : /* We expect that recomposed has exactly one character now. */
327 : *a = g_utf8_get_char (recomposed);
328 : g_free (recomposed);
329 : ret = true;
330 : }
331 :
332 : g_free (normalized);
333 : return ret;
334 : }
335 :
336 : static unsigned int
337 0 : hb_glib_unicode_decompose_compatibility (hb_unicode_funcs_t *ufuncs HB_UNUSED,
338 : hb_codepoint_t u,
339 : hb_codepoint_t *decomposed,
340 : void *user_data HB_UNUSED)
341 : {
342 : #if GLIB_CHECK_VERSION(2,29,12)
343 0 : return g_unichar_fully_decompose (u, true, decomposed, HB_UNICODE_MAX_DECOMPOSITION_LEN);
344 : #endif
345 :
346 : /* If the user doesn't have GLib >= 2.29.12 we have to perform
347 : * a round trip to UTF-8 and the associated memory management dance. */
348 : gchar utf8[6];
349 : gchar *utf8_decomposed, *c;
350 : gsize utf8_len, utf8_decomposed_len, i;
351 :
352 : /* Convert @u to UTF-8 and normalise it in NFKD mode. This performs the compatibility decomposition. */
353 : utf8_len = g_unichar_to_utf8 (u, utf8);
354 : utf8_decomposed = g_utf8_normalize (utf8, utf8_len, G_NORMALIZE_NFKD);
355 : utf8_decomposed_len = g_utf8_strlen (utf8_decomposed, -1);
356 :
357 : assert (utf8_decomposed_len <= HB_UNICODE_MAX_DECOMPOSITION_LEN);
358 :
359 : for (i = 0, c = utf8_decomposed; i < utf8_decomposed_len; i++, c = g_utf8_next_char (c))
360 : *decomposed++ = g_utf8_get_char (c);
361 :
362 : g_free (utf8_decomposed);
363 :
364 : return utf8_decomposed_len;
365 : }
366 :
367 : hb_unicode_funcs_t *
368 0 : hb_glib_get_unicode_funcs (void)
369 : {
370 : static const hb_unicode_funcs_t _hb_glib_unicode_funcs = {
371 : HB_OBJECT_HEADER_STATIC,
372 :
373 : NULL, /* parent */
374 : true, /* immutable */
375 : {
376 : #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_glib_unicode_##name,
377 : HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
378 : #undef HB_UNICODE_FUNC_IMPLEMENT
379 : }
380 : };
381 :
382 0 : return const_cast<hb_unicode_funcs_t *> (&_hb_glib_unicode_funcs);
383 : }
384 :
385 : #if GLIB_CHECK_VERSION(2,31,10)
386 : /**
387 : * hb_glib_blob_create:
388 : *
389 : * Since: 0.9.38
390 : **/
391 : hb_blob_t *
392 0 : hb_glib_blob_create (GBytes *gbytes)
393 : {
394 0 : gsize size = 0;
395 0 : gconstpointer data = g_bytes_get_data (gbytes, &size);
396 0 : return hb_blob_create ((const char *) data,
397 : size,
398 : HB_MEMORY_MODE_READONLY,
399 0 : g_bytes_ref (gbytes),
400 0 : (hb_destroy_func_t) g_bytes_unref);
401 : }
402 : #endif
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